Note: These objects tend to be extremely distant
from Sol, in space and even time.
Many are also extremely large, massive, dense, energetic,
ancient, or young. All have been estimated to be over 100
light-years (ly) -- or 30.7 parsecs (pc) -- away. Most
are at least 1,000 ly (or 306.6 pc) away. For more
information about the
Milky
Way Galaxy and its stars (including spectral and
luminosity class codes), go to ChView's webpage on The Stars of the Milky Way.